package com.Student;

import java.util.ArrayList;
import java.util.Scanner;

public class Studentmanager {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        ArrayList<Student> list=new ArrayList<>();
//jhujh
        lo:while (true){
            System.out.println("------欢迎来到学生管理系统");
            System.out.println("1 添加学生");
            System.out.println("2 删除学生");
            System.out.println("3 修改学生");
            System.out.println("4 查看学生");
            System.out.println("5 退出");
            System.out.println("请输入您的选择");

            String choice = sc.next();
            switch (choice){
                case "1":
                    System.out.println("添加学生");
                    addStudent(list);
                    break;
                case "2":
                    System.out.println("删除学生");
                    deleteStudent(list);
                    break;
                case "3":
                    System.out.println("修改学生");
                    updateStudent(list);
                    break;
                case "4":
                    System.out.println("查看学生");
                    queryStudent(list);
                    break;
                case "5":
                    System.out.println("感谢您的使用");
                    break lo;
                default:
                    System.out.println("您的输入有误");
                    break;
            }

        }

    }

    public static void updateStudent(ArrayList<Student> list) {
        System.out.println("请输入您要修改的学生学号");
        Scanner sc=new Scanner(System.in);
        String updatemid=sc.next();
        int index=getIndex(list,updatemid);
        if (index==-1){
            System.out.println("查无信息，请重新录入");
        }else {

            System.out.println("请输入新的学生姓名");
            String name=sc.next();
            System.out.println("请输入新的学生年龄");
            int age=sc.nextInt();
            System.out.println("请输入新的学生生日");
            String birthday=sc.next();
            Student stu=new Student(updatemid,name,age,birthday);
            list.set(index,stu);
            System.out.println("修改成功！");
        }
    }

    public static void deleteStudent(ArrayList<Student> list) {
        System.out.println("请输入您要删除的学生学号");
        Scanner sc=new Scanner(System.in);
        String deletemid=sc.next();
        int index=getIndex(list,deletemid);
        if (index==-1){
            System.out.println("查无信息，请重新录入");
        }else {
            list.remove(index);
            System.out.println("删除成功！");
        }
    }

    //查看
   public static void queryStudent(ArrayList<Student> list) {
      if (list.size()==0){
          System.out.println("无信息，请重新添加");
          return;
      }
       System.out.println("学号\t姓名\t年龄\t生日");
       for (int i = 0; i <list.size() ; i++) {
           Student stu=list.get(i);
           System.out.println(stu.getMid()+"\t"+stu.getName()+"\t"+stu.getAge()+"\t"+stu.getBirthday());
       }
    }

    //添加学生
    public static void addStudent(ArrayList<Student> list) {
        Scanner sc=new Scanner(System.in);
        String mid;
        while (true){
            System.out.println("请输入学号：");
             mid=sc.next();
            int index=getIndex(list,mid);
            if (index==-1){
                break;
            }
        }

        System.out.println("请输入姓名：");
        String name=sc.next();
        System.out.println("请输入年龄：");
        int age=sc.nextInt();
        System.out.println("请输入生日：");
        String birthday=sc.next();
        Student stu=new Student(mid,name,age,birthday);
        list.add(stu);
        System.out.println("添加成功！");
    }
    public static int getIndex(ArrayList<Student>list,String mid){
        int index=-1;
        for (int i = 0; i <list.size() ; i++) {
            Student stu=list.get(i);
            String id=stu.getMid();
            if (id.equals(mid)){
                index=i;
            }
        }
        return  index;
    }
}
